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fd_util.c
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fd_util.c
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/* libmpdclient
(c) 2003-2010 The Music Player Daemon Project
This project's homepage is: http://www.musicpd.org
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code is copied from MPD. It is a subset of the original
* library (we don't need pipes and regular files in libmpdclient).
*
*/
#include "fd_util.h"
#include <assert.h>
#include <stdbool.h>
#include <fcntl.h>
#include <errno.h>
#ifdef WIN32
#include <winsock2.h>
#else
#include <sys/socket.h>
#endif
#ifndef WIN32
static int
fd_mask_flags(int fd, int and_mask, int xor_mask)
{
int ret;
assert(fd >= 0);
ret = fcntl(fd, F_GETFD, 0);
if (ret < 0)
return ret;
return fcntl(fd, F_SETFD, (ret & and_mask) ^ xor_mask);
}
#endif /* !WIN32 */
static int
fd_set_cloexec(int fd, bool enable)
{
#ifndef WIN32
return fd_mask_flags(fd, ~FD_CLOEXEC, enable ? FD_CLOEXEC : 0);
#else
(void)fd;
(void)enable;
return 0;
#endif
}
/**
* Enables non-blocking mode for the specified file descriptor. On
* WIN32, this function only works for sockets.
*/
static int
fd_set_nonblock(int fd)
{
#ifdef WIN32
u_long val = 1;
return ioctlsocket(fd, FIONBIO, &val);
#else
int flags;
assert(fd >= 0);
flags = fcntl(fd, F_GETFL);
if (flags < 0)
return flags;
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
#endif
}
int
socket_cloexec_nonblock(int domain, int type, int protocol)
{
int fd;
#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
fd = socket(domain, type | SOCK_CLOEXEC | SOCK_NONBLOCK, protocol);
if (fd >= 0 || errno != EINVAL)
return fd;
#endif
fd = socket(domain, type, protocol);
if (fd >= 0) {
fd_set_cloexec(fd, true);
fd_set_nonblock(fd);
}
return fd;
}